Mihni



(No Model.)

E. R. BYGOWELL. TIME CHART.

No. 445,392. Patented Jan. 2K7, 41891.Y

UNITED STATES PATENT i, Erica- EDVARD R. E. COIVELL, OF YPSILANTI, MICHIGAN, ASSIGNOR OF ONE-HALF TO HENRY P. GLOVER, OF SAME PLACE.

TIME-CHART.

SPECIFICATION forming part of Letters Patent No. 445,392, dated January 27', 1891.

Application filed June 23, 1890. Serial No. 356,321. (No model.)

To all whom t may concern..-

Be it known that I, EDWARD R.' E. CownLL,

a citizen of the United States, residing at Ypsilanti, in the county of lVashtenaw and State of Michigan, have invented certain new and useful Improvements in Time-Charts, of which the following is a specification, reference being had therein to the accompanying drawings. This invention relates to new and useful improvements in time-charts; and the invention consists in applying to a map marked with the meridians arranged at specified distan ces apart a movable strip slidingly secured to the map or chart and marked with the divisions of time corresponding with the time intervals between the meridians; also so arranged that by registering a given meridian at a given hour the corresponding time of all other meridians will be indicated.

The invention further consists in the combination and arrangement of the various parts, as more fully hereinafter pointed out, and shown in the accompanying drawings, in which-- Figure l is a perspective view of my device partly closed, and Fig. 2 is a plan view thereof.

A is a suitable back, preferably of paper, and consisting of two leaves C and D folded centrally to form two leaves. Upon this back or sheet of paperis printed a map of the world extending to near the top, and also the meridians E, arranged at stated intervals apart. and marked in degrees the distance from the standard meridian, such as Greenwich.

I preferably make the central or standard meridian upon the line F, at which the map is folded.

Above the map the space G, over which is slidingly secured the strip II. This strip I secure to the back preferably by forming slits a at suitable intervals and pass a ilexr ble ribbon therethrough, as plainly shown in the drawings. Upon this strip is marked two series of figures I from l to 12, indicating the hours of the day. In the normal position of the device the central figure 12 is over the central or standard meridian, and the figure 12 at each edge is over the one hundred and eightieth meridian or the greatest distance from the middle. I also mark this strip with the divisions of the day, as night, morning, noon, and afternoon, the distance between the figures indicating the-hours of the day eorrespending with the distance upon the meridians upon the map. The meridians are preferably arranged that every fifteen degrees indicated an hour of sun time and the time intervals corresponding therewith would indi- 6o cate the hours of the day.

The use of the deviceis especiallyintended for travelers on shipboard or elsewhere to ascertain the time at any point of the world af ter ascertaining their own location in degrees of longitude. For instance, if that traveler finds himself upon the sixtieth degree of east longitude at noon of a given day, by moving the strip carrying the hours of the day until the figure 12, marked 110011, was over this 7o siXtieth degree, the other hours upon the strip would register meridians uponthe map and indicate the time at these meridians at the same moments.

It is evident that the strip may be moved along this to indicate to the traveler crossing mid-ocean the time in any part of the world corresponding tothehour at which he makes the adjustment of the strip upon the map.

In making my device I will preferably ar 8o range the meridians to indicate the hours, half-hours, and quarter-hours, and mark the strip to indicate the same divisions of time.

By making the article in the shape of a twoleaf book I am enabled to bring the fold at the standard meridian, and thus put it in compact shape and enable the user to more readily adjust the device east or west from the central point. I

What I claim as my inventionuism l. In a time-chart, the combination of a map on Mercators projection, having the meridians marked thereon at intervals both ways from the stand ard meridian, and a sliding strip marked with divisions of time corresponding 95 to the intervals between the meridians and slidingly secured in the chart by passing through the same at intervals, substantially as described.

2. In a time-chart, the eombination,with a 10o tiaily as described.

| Tu testimony whereof I n'iix my signature in i presence of two witnesses.

EDWARD R. ic. COWELL.

'Witnessesz M. B. ODOGHERTY, JAMES WHITTEMORE.

ump on Mercator-s projection, having the m ridifms marked thereon, of :i sliding strip marked with divisions of time corresponding to the time intervals between the meridians and secured in position by passing through slits in the chart; beyond the map, substan- 

